Seit einem Tag läuft Service Windows Update nicht und kann nicht gestartet werde.
Die abhängige Services laufen.

Deshalb wollte ich   den  von DELL angebotenen Schnelltest durchführen.

beim Versuch  DellSystemDetectLauncher.exe  zu starten, bekomme ich folgendes

PLATFORM VERSION INFO
    Windows             : 6.1.7601.65536 (Win32NT)
    Common Language Runtime     : 4.0.30319.34209
    System.Deployment.dll         : 4.0.30319.34244 built by: FX452RTMGDR
    clr.dll             : 4.0.30319.34209 built by: FX452RTMGDR
    dfdll.dll             : 4.0.30319.34244 built by: FX452RTMGDR
    dfshim.dll             : 4.0.41209.0 (Main.041209-0000)

SOURCES
    Deployment url            : downloads.dell.com/.../DellSystemDetect.application

ERROR SUMMARY
    Below is a summary of the errors, details of these errors are listed later in the log.
    * Activation of downloads.dell.com/.../DellSystemDetect.application resulted in exception. Following failure messages were detected:
        + Error creating the Web Proxy specified in the 'system.net/defaultProxy' configuration section.
        + Der angeforderte Dienstanbieter konnte nicht geladen oder initialisiert werden

COMPONENT STORE TRANSACTION FAILURE SUMMARY
    No transaction error was detected.

WARNINGS
    There were no warnings during this operation.

OPERATION PROGRESS STATUS
    * [03.09.2015 15:52:20] : Activation of downloads.dell.com/.../DellSystemDetect.application has started.

ERROR DETAILS
    Following errors were detected during this operation.
    * [03.09.2015 15:52:20] System.Configuration.ConfigurationErrorsException
        - Error creating the Web Proxy specified in the 'system.net/defaultProxy' configuration section.
        - Source: System
        - Stack trace:
            at System.Net.Configuration.DefaultProxySectionInternal.GetSection()
            at System.Net.WebRequest.get_InternalDefaultWebProxy()
            at System.Net.HttpWebRequest..ctor(Uri uri, ServicePoint servicePoint)
            at System.Net.HttpRequestCreator.Create(Uri Uri)
            at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase)
            at System.Deployment.Application.SystemNetDownloader.DownloadSingleFile(DownloadQueueItem next)
            at System.Deployment.Application.SystemNetDownloader.DownloadAllFiles()
            at System.Deployment.Application.FileDownloader.Download(SubscriptionState subState)
            at System.Deployment.Application.DownloadManager.DownloadManifestAsRawFile(Uri& sourceUri, String targetPath, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
            at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestDirectBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options, ServerInformation& serverInformation)
            at System.Deployment.Application.DownloadManager.DownloadDeploymentManifestBypass(SubscriptionStore subStore, Uri& sourceUri, TempFile& tempFile, SubscriptionState& subState, IDownloadNotification notification, DownloadOptions options)
            at System.Deployment.Application.ApplicationActivator.PerformDeploymentActivation(Uri activationUri, Boolean isShortcut, String textualSubId, String deploymentProviderUrlFromExtension, BrowserSettings browserSettings, String& errorPageUrl)
            at System.Deployment.Application.ApplicationActivator.ActivateDeploymentWorker(Object state)
        --- Inner Exception ---
        System.Net.Sockets.SocketException
        - Der angeforderte Dienstanbieter konnte nicht geladen oder initialisiert werden
        - Source: System
        - Stack trace:
            at System.Net.NetworkAddressChangePolled..ctor()
            at System.Net.AutoWebProxyScriptEngine.AutoDetector.Initialize()
            at System.Net.AutoWebProxyScriptEngine..ctor(WebProxy proxy, Boolean useRegistry)
            at System.Net.WebProxy.UnsafeUpdateFromRegistry()
            at System.Net.Configuration.DefaultProxySectionInternal..ctor(DefaultProxySection section)
            at System.Net.Configuration.DefaultProxySectionInternal.GetSection()

COMPONENT STORE TRANSACTION DETAILS
    No transaction information is available.